See also the CAUSE Webinar [http://www.causeweb.org/webinar/teaching/2010-04/ Using (and contributing to!) the Chance News Wiki] by Jeanne Albert and Bill Peterson. There are step-by-step screen shots of an actual editing session

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beginning on page 12 of the slides, which you can download in [http://www.causeweb.org/webinar/teaching/2010-04/2010-04.pdf PDF] or